@import url(https://fonts.googleapis.com/css?family=Pacifico);

* {
  margin: 0;
  padding: 0;
}

body {
  display: flex;
  height: 100vh;
  justify-content: center;
  align-items: center;
  text-align: center;
  background: black;
}

.neon {
  color: #cce7f8;
  font-size: 2.5rem;
  font-family: 'Pacifico', cursive;
  text-transform: uppercase;
  animation: shining 0.1s alternate infinite;
}

@keyframes shining {
  from {
    // 多个阴影进行叠加
    text-shadow: 0 0 6px rgba(182, 211, 207, 0.9),
      0 0 30px rgba(182, 211, 207, 0.3), 0 0 12px rgba(15, 115, 223, 0.5),
      0 0 21px rgba(15, 115, 223, 0.9), 0 0 34px rgba(15, 115, 223, 0.8),
      0 0 54px rgba(15, 115, 223, 0.9);
  }
  to {
    text-shadow: 0 0 6px rgba(182, 211, 207, 1),
      0 0 30px rgba(182, 211, 207, 0.4), 0 0 12px rgba(15, 115, 223, 0.6),
      0 0 22px rgba(15, 115, 223, 0.8), 0 0 38px rgba(15, 115, 223, 0.9),
      0 0 60px rgba(15, 115, 223, 1);
  }
}
